Your friend works in a biotech company that has just discovered a drug that seems to promote lamellipodia formation in cells. Which of the following molecules is unlikely to be involved in the pathway that this drug affects?
(a) Rac
(b) ARP
(c) actin
(d) myosin
(d) Myosins are not directly involved in lamellipodia formation. Lamellipodium formation involves branched actin structures that use ARP for their formation, and thus ARP and actin are likely to be involved [choices (b) and (c)]. The Rho family member Rac triggers lamellipodia formation when activated, and thus may be involved [choice (a)].
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A couple in which the woman is homozygous dominant for clotting ability and the man has hemophilia A willproduce:a
carrier daughters and affected sons. b. affected daughters and affected sons. c. carrier daughters and normal sons. d. normal daughters and normal sons. e. offspring of unknown genotype for this gene.
GCCCAAAG is a molecule of
A. RNA. B. DNA. C. protein. D. cannot tell as written.
The first modern practitioner of taxonomy was ____
a. Ernst Mayr b. Jean Baptiste de Lamarck c. Alfred Russel Wallace d. Charles Darwin e. Carolus Linnaeus
Evidence supporting the idea that mitochondria and chloroplasts in present-day cells originated as independent organisms includes
A. similarity between photosynthetic pigments in chloroplasts and cyanobacteria. B. similarity in the way mitochondria, chloroplasts, and bacteria reproduce. C. similarities in DNA sequences between mitochondrial and bacterial genomes. D. All of the answer choices are correct. E. similarities in size and shape between mitochondria and some bacteria.